Unit brake

Abstract

Disclosed is unit brake, which is equipped with a cylinder apparatus in which a clutch mechanism that switches between transmitting or cutting off a biasing force of a spring brake part is disposed, is capable of preventing a braking force due to the spring brake part from unintentionally decreasing due to a meshing section of the clutch mechanism disengaging, and is of a size that can replace an existing unit brake, and maintains the performance of bearings in the clutch mechanism even with long-term use. The clutch mechanism of the unit brake includes: a nut member that rotatably screws on a spindle that is positioned in an area that communicates with the atmosphere, and is movably supported in a direction opposite to braking; a clutch that is disposed in a direction opposite to braking with respect to the nut member, and faces the nut member in the vicinity of the spindle; a clutch box that is formed in a cylinder shape, and houses the nut member and clutch on the inside; and bearings that rotatably support the nut member on the inside of the clutch box.

Description

TECHNOLOGY FIELD[0001]This Invention relates to a unit brake with a regular brake part and a spring brake part.BACKGROUND TECHNOLOGY[0002]A cylinder device and a brake body attached to this cylinder device are equipped as a unit brake for vehicle braking, to activate the cylinder device, and bring a brake shoe retaining relative displaceability versus the brake body into contact with the vehicle wheel, to brake the rotation of the vehicle wheel. For the cylinder device in this type of unit brake, for example, in brake devices for rail vehicles, cylinder devices are known that can be activated with both a regular brake part activated with compressed air (compressed fluid) used in normal operations, and a spring brake part activated by a spring force even without use of compressed air, used for stopping the vehicle over a long time (see Patent Citation 1). In the cylinder device disclosed in Patent Citation 1, the regular brake part has a rod protruding and has installed a first pisto...

AI Technical Summary

Benefits of technology

This patent is about a unit brake system that prevents the brakes from relaxing when the clutch is engaged. The system uses a cylinder device with a clutch mechanism to switch between transmission and blocking. To prevent unintentional relaxation of the brakes, the system is designed to provide a spring brake part that can maintain performance even during long-term use. The clutch is positioned in the opposite direction of a spring brake part, and a nut member is supported in a way that allows it to move in the opposite direction. This prevents the spring brake part from relaxing during use. The system also prevents the clutch mechanism from becoming loose or relaxed, and it helps to maintain the performance of the brakes even in humid or drier environments. The system is compact and can be easily installed in existing vehicles.

Problems solved by technology

As a result, there are cases where the convex-concave teeth in the nut member and sleeve member do not fully grip all the way to the back, and the rod and second piston remain linked with only the forward tip parts gripped together.

In addition, while use of the unit brake listed in Patent Citation 2 (Laid Open No. 2010-164193 Publication) solves the above-mentioned issue, there is a problem in that it cannot be exchanged as is for existing vehicles where the Patent Citation 1 (Laid Open No. 2008-101766 Publication) unit brake is used, because of an installation space problem.

Furthermore, since the bearing used in the clutch mechanism of the unit brake listed in Patent Citation 2 (Laid Open No. 2010-164193 Publication) is used inside a compressed air atmosphere generated by a compressor, there is a problem of adverse effects due to humidity, etc.

In particular, the said problem appears quite notably in cases of vehicles used overseas where dehumidification devices are not installed.

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